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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaa7f8738c8036aabf6d2700ec75f3bc192b83be0132b7bf017b2ebeff5f0bb' 
  AND token = 'CqqiNURD8q8fQk9dPDuyx84AuGmIgQ5p62UaqeLNks0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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