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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3de0444646653e6a53d777700f0dbec173d381b995cfc0652055e27f2560b4' 
  AND token = 'UuRvtKe1cpifvoZTlEx2ilsdv4i5FAJhBHJmY2oelMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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