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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383b42197db53255d1f8581e31d3a6e652f8abd856c5f8615bd6ca3e116dd2a4' 
  AND token = 'Z2jd6tJ4fRUiwxvdXfFvtmY+lrZ/lNQmCGLtEoVY1xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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