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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b4d83b928cc21fc4ac5936382f397150e801fdf7c6826dcd71168031f184b3' 
  AND token = 'qozt9sMIGTWb3QRvjx/dJAW5+bV3mokr0e0n8rtpI1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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