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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cc883a0f70fdbd6020444676e26b58d5125a7af85fc783b8c570da067b059d' 
  AND token = '2Fc7YPACN8zm955d+rQ9kgXkRonB+pgI3DRKQBkJeLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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