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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3b9c8cc3ef8e15d8854921add87e64b61d73d2cde1b1848e9f77020662ba1b' 
  AND token = 'SFz286ffpLCDJ7fDdgSJO5OzvpTtV4RimNfr9vaC9h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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