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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952958fd228f0986958c1ba445573f4fe78ddec079a9b04113c2d97a28127fa0' 
  AND token = 'MBZ042QXCApAHB2EsZ2p0lvolbGHct6iqyaUac8bBoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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