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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511f08640b4dfbc0ed6ca7cb6da0ffda58ed661f30ca9d3090de6d00f3b2b1ee' 
  AND token = '0PAeD2npFj8ZehNBWcoo747UJTuVsVdNYIW6b1m9LHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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