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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ffbcb1bc53b54d2838a32f40b63b40a75f2cb398d0893553e92df87b3ab5e9' 
  AND token = 'h87b98rU5TuJRTSQxSofnvDozIOr/c3U6U+a/FdqG2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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