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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76c257c7f7ee1dd4e1cba4dedb6f8e4fad5662376847812060be305561f58c3' 
  AND token = 'ix2oKX8GEvW4+UpQc9sF4SW3D0VpNbukaOu38TBSx8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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