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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f425bd3a5be100617025015f5650005ae80847d93c343e5ac457129eeb5d3835' 
  AND token = 'UAN7fygSjmud62k8CzeCo+xTOSuqVdr0cETes0L0+8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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