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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60de479680be0b85f4d2c98f24021d06a436667c4fab130f4c287c65020ca09b' 
  AND token = 'q0P5mlPpV7+KDfKkLdq4sgzlfWxYyo7zun90+eB5L3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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