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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12ee8c55743cbfa9586d8dea1b90669fb08c08c6566b98358e613a6319f18bc' 
  AND token = '7O4w9t379aSi0fWDCg2HBLZeoSQoa+KqeGN2c9eURGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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