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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59a0bc3cf31a4df4272d4e7b623053f881348d9648a86c188b5ce15190b250b' 
  AND token = '9vFnWDNxO42oOacOD9oRaQ6hvOrHNFFA2UdpWdXgcSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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