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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede185f06f1292a8f9a44c7c1665eab845ffd345cfe7760b618eceeb4e36285a' 
  AND token = 'GGRwKOhYRETh5bCZ88zkN32hl42hV1fCvNCOVOUswBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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