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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbe36966b4bb1c751ca9adee89b7ba0800560d90bfd85c38a5df5bb7d4f0b14' 
  AND token = '1jddkr+94n1F4FGCL66RK1R1q3KSoWo+MqGZWI9FtPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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