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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc22dbd945433165b400f9ee1c0f597c2ec54fa58c0a9d782d23ca9d447a71e' 
  AND token = 'M0JSTr8F+FhFwQWeyGgod7If2vy9+9WoJleifzPndFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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