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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571c8ea5f8f5058c687bba8b7c92d422b5c7f2e0771a755332fbc809341b2e25' 
  AND token = 'RhTVx8zik+EXDfAsTCXEo+/IyoTajBmwU+CSdI5cROs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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