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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cee80897d29142530e42671205fcda12613c351dfe0cade99f90cfb81a85658' 
  AND token = 'eNx2D7VdyH25jfFbfV5YQD1rGd7iy8Y9cKLZISkcI7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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