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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470b545d0e291378c767f4a304991d7551bd85a09f4e39ff282fed2afe0ead43' 
  AND token = 'BP2KC8ixvkXxojeZp3OX/aVcF/hpFWKNBqbXxSXxcpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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