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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5888d6f20d6dae17a1048ac1569224c79b10a335fed2f94f322e56c36f872aa5' 
  AND token = '5Li050uMX6s2EftPenCSNJxnxNY+ME3cqYH+a1a/OoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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