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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba1b0c35ec580e0c3e42aef07e60a30f97cd6cedb5254046b14334859cf1cf2' 
  AND token = '4NY+t9wY2R/8VImYQCrsP+IlJH/4ammLWrzBUsd7uo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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