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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb15fb5e1b2b02f6b95f922cc4cbe401f98dbc36170ef033a821014e8c3d8cf' 
  AND token = 'hO3lMpPiS6Q7kOtR/P1JkfbJOPRhsJtcwlE2ANkpxJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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