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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87b39325e35c13e43c3f40f64b3a35ffff68145e9ca3e3e712fe5c2c7d0867c' 
  AND token = 'Rm4wPf+ESJ0y4iI756iOyVa2jqul5mVl3dhIA9Uff8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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