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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cc7d7d4da94ecff6dab61e9dd474440ef4a636ac05161cc6470ff8b7888cc0' 
  AND token = '2wgxBhDytOiJ5/nmZaicejw5Wt3aDEHD6q450LK92Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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