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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3795305da10bd0cd1b2bb2d477fec3bd9acf722abb87e34f3cf00aaca65dd87c' 
  AND token = 'bAHF5ZEQYxcjn6I5862i9lRz7wi4Lbsf7xCaY7i5Hng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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