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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b662c5d584c433615055946c577a7e1b2e78050c2fae9a8337f4c5604f69a3f' 
  AND token = 'rG/dcXNqPbTu91ebDQTCHm+buWSVi8UiOPCIgjq5vMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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