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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2ad397efeb949df0722fee65adcdb1e27ce7a14df4b379724d368fa00bf6bb' 
  AND token = '8VJWBt8Okpqc5DiXNvj79AL6rutz7oCL6A9ofq306Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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