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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7dc1bcbd7e051e48b758343a6cfb9be53606c1322b7649518e7df8ad7d1499' 
  AND token = 'GiYbxrg1p4CNa85pkpVnF21ZXL5TatGXv1aYCtTBbmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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