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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0665e90fc431642c44e2d1b4bde4872044f0bdc62606108863d73a07cfc515aa' 
  AND token = 'JiLXr5u659B/jTl6x0IYQ0pzB8lFy2uQfYw/RraHFdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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