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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc48551c99a7760ddcd75ce930c516c7166c4f6a4952cb6e731120fff45d6bf' 
  AND token = 'ibNGLqsdOYqO47GQvigCGLEgG6jr2ROkFFB+d49Vw2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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