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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f323a278bfbb33f82b5d52d85d6a6db5c194f18b0c33dff3c4efe0ce4a8a90cd' 
  AND token = '1HIy69tzsmXc+GfT422JXmdbx5Tjisx8oZ2XVgxemGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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