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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3830891136e38bf95eeb9898ef23c358848b9ded3f9845df6875092081f451' 
  AND token = 'kPVvyu5g6VdAIlg06KH4lb4gskhFacbu3gCsV6I6gGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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