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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70c17fc29ea235205a884dd651cefc29fc45fa0bb660f8bf80e58f2acdf982e' 
  AND token = '1041pdt8hvDCP2mdNd0T+T08MDj9fHGBLS5RZUocu6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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