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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ade87b0a68261dbe90be8506efd68ff760797b2a098394ddde6e30f7ddcc90' 
  AND token = 'K+X+vsFRY7E0wsne06gxvz/w3Y+xwR/ZLMi/OyldNg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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