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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0f7717ac47cec243296e6f8fe90e0bd8b440de3c31582ddf491605d2282318' 
  AND token = '2RQr1rfHTuBcHeNwsCb+U7duCfXjNPSEa5bVSNMgaOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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