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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b585e7b9b1c6fb8287e1f35130e76ebd1a26a7aae06aa5c4601781cf104053' 
  AND token = 'TdxNVIfhndP3Jm0kcqvke1vTVu0b9UbxGA+pvdmaH7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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