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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed10eb7db1c83e291f7d615ae261ee79489ec6021fd07e6aaee82e60baaf2e1' 
  AND token = 'QYCCLrSF5EZvFRkUGmTAw7x7LKn7ybMIA3zKd0n1M60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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