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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c442412698770a6dc4d703a7031cc171fa79727be7e85a7566fd60bf077dbe65' 
  AND token = '9g5yT0BIO9G506YXD16+phAquUBmW3LEQtBZ/ZT8tJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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