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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a05020d56ade47c9b15a8a37ea899b738400f7d7662788ce3c4be9052a76f2' 
  AND token = 'IQXfyBGnNBzZn/TrQToQv/BiqG2RNPw/SatN+hhe0P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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