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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6656e68dae2f573abc7ace205c0be591a381f0bfd70393cd6c3d1e8dd7b93f5' 
  AND token = 'm2+Wa7ytSVGqycps0Hx0Hc/1nPL1y3eD4xOT6bu4Ufg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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