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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9f72a4cf5a889128c2a0fdd07dd18136e7f5cac3b0f53680fa3eb3f868e106' 
  AND token = '2wPzts9ts10Fk7yQW3k1c/ZUsXIMce/jEZryWWBPjKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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