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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed05c430a34f88b4df12a8af9e6677046f502dc62fac5189c1b29a51b883ca23' 
  AND token = '/+9XPT6WlnsM1FNf2CccjO2QV+o+85/yFngTg6QCNaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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