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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821fe50241272d1ddd7d0940665a3cf3217dbf709c952e0786c9c91fa7ff8cdf' 
  AND token = 'zp4H9ChNedtslrARb1OENeqzDvho7XqSDEEyYJl3g8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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