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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb89cd25ccf0dcf83c1332e5582fa6b58d33e1a5b5f804eb056247268581e89' 
  AND token = '+lcrP05zKGZEBldVVR7sEx9tKJZ+9TmIT4cBuBNX1Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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