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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfabf1e282556953ae8a8f87e67481acea05b2ba1d41b7f8ded4390ea7797db1' 
  AND token = '3KEidgtI0/pGOkqlvkQIaCc8sKzCLodU6rch0x8tJDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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