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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b59902295da35d0ad103400ebb21339f098cd6ee304a54a58ba7b873c5bb1a0' 
  AND token = 'HNskftnoZ+DRjGHYGXuzPyZ1M1D8UI+f/3maSkTnh04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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