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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b1a4d0b7b5773aa1d2ca888c3698f8f15db125ed559bcc613940c9bc58a8c3' 
  AND token = 'aBUeCa6CwgoP6L77U+FEFZoHTnEHmGew2VqaOajEL6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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