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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c735817d94ef41b0df25e7b27bac7339c780bb55803e30429d8474fd1e2b02' 
  AND token = 'wvFNF8z7R1IFaqfP5+AlcTz3185cnWUscbx9AMSectc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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