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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c222ca55527fd158e03e9a92ffef0250e3bee465c4a5a356e4658db7632b55' 
  AND token = '9xpSTkc0u2BBzmIjLclO/urMgvIa1steu8n3n3KoGz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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