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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c09618d079f17016ec048251c847e4221fc045a15242e19813205d59af261d' 
  AND token = '25eAVt16AvxgIqG7uUOXpqX0PEc4NScWp988Cp6M/lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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