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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a107ce2262ca95a245b5559cd74848eb1038ddf5133d9fd7a0f59e1b7ced155' 
  AND token = 'OYwrMKve8AcfupjMY2w4zrcLjW6mKNPj1m2c/M+f1aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}