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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6123fb9d91291766e86f13bb6c0fe9c9d82151a26a428e363b4ac940dfa8867a' 
  AND token = 'rXDBytBNqCudQ4Vniv5wIb2bQwkgDMThao5EPLyE15k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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