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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20646cbff10a83ed5ce01348d1e70eb7d9af28f4f9716b19f0c9acf2862e14b4' 
  AND token = 'pEQJwdF/akPQrA1oDFrW9x08VT5fOMYPH6fdvAMvzQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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