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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f03ccfd831a9f194e968c67ece0c701daa32b9480f22b9691c233af884c5c3' 
  AND token = 'pqW3SedjNuCJ13GQJ36/gS97+dx6LdH/nNcyEInl/q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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