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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2cca2f6b4c63be674ec7c63ac36ea1b2c107346c394a631d8434613ebe52dd' 
  AND token = 'RLxAhuLVSPXlnVkHdtk27kPYSZSwQZd7HiAUpbVSBnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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